Occasionally in reading i'll come across the term high solids in discussions. Gets me to thinking about colors and types of paint. Right now i'm working on some old gas pumps. First one will sit outside so I want it to weather naturally after I restore it so I'm using SS paints. White & Dark Green on the sides sitting on a black base (Sinclair). Does it make a drastic difference if I were to go over a gray epoxy sealer vs a white epoxy sealer? I only have gray right now and plenty of it but next one will be Shell and i'm planning on using SPI Med Red which does ask for a white sealer... if I read correctly?